Your window is seven months long
Your Initial Enrollment Period (IEP) runs for seven months: the three months before your 65th birthday month, your birthday month itself, and the three months after. If you enroll during the three months before your birthday month, your coverage typically begins on the first day of the month you turn 65, with no gap and no scramble.
Write your own seven months down on a calendar. Everything else in this article hangs off those dates.
Three months out: gather four facts
Before you compare a single plan, collect the four facts that decide which plans deserve your attention:
- Your current coverage. Employer plan, marketplace plan, retiree coverage, or none.
- Your prescriptions. Exact names and dosages, because drug coverage differs plan to plan.
- Your doctors and hospitals. The ones you want to keep seeing.
- Your monthly budget. What you can comfortably spend on premiums and care.
These are exactly the four things we ask about in a first conversation, and they turn a wall of plan options into a short list.
Two months out: understand your two paths
Broadly, people entering Medicare choose between two structures: Original Medicare (Parts A and B) usually paired with a Part D prescription plan and often a Medicare Supplement, or a Medicare Advantage plan (Part C) that bundles coverage through a private insurer. Each path fits a different set of priorities around doctors, travel, and how you prefer to pay for care.
The differences matter enough that we wrote a separate plain-language comparison: Medicare Advantage vs. Supplement: which fits you?
One month out: make the decision, not just a note
By one month before your birthday month, aim to have three things settled: which path you are taking, which specific plan on that path fits your doctor and prescription lists, and how you are enrolling. Original Medicare enrollment runs through Social Security, online, by phone, or in person, and it is worth doing early in the month rather than at the end. If a private plan is part of your picture, the plan enrollment has its own paperwork on top of that.
This is also the month to confirm the boring details that cause real problems later: your name as Social Security has it, your mailing address, and whether you are already receiving Social Security benefits, because if you are, Parts A and B enrollment generally happens automatically and your card simply arrives in the mail.
Your birthday month and the two after
You can still enroll during your birthday month and the three months that follow, but your start date moves later. Since a 2023 rule change, coverage generally begins the first of the month after you sign up, so enrolling late in the window can leave weeks where you are not yet covered.
If you miss the window
Missing your IEP without other creditable coverage can mean late enrollment penalties that stay with you for as long as you have Medicare, and waiting for the General Enrollment Period to come around. The rules and the math are covered in our guide to late enrollment penalties.
One important exception: if you are still working at 65 with employer coverage, delaying can be the right move. That situation has its own rules, covered in Still Working at 65?
The safety net if life got in the way
If you miss all seven months and no Special Enrollment Period applies, you generally wait for the General Enrollment Period, January 1 to March 31 each year, and coverage starts the month after you sign up. That gap, plus the penalties that can come with it, is why the calendar work at the start of this article matters more than any plan comparison.
- Your enrollment window opens 3 months before your birthday month and runs 7 months
- Enroll in the first 3 months for day-one coverage
- Gather your coverage, prescriptions, doctors, and budget before comparing plans
- Late enrollment without creditable coverage can mean permanent penalties
- A no-cost review with a local broker covers all of it in one call
Common questions
Do I have to enroll at 65 if I’m still working?
Not always. If you have creditable employer coverage, you may be able to delay without penalty. The employer’s size matters, so check the rules before deciding.
Does enrolling through a broker cost more?
No. Your premium is the same whether you enroll through us or directly with the carrier. Our guidance is at no additional cost to you.
Keep reading
Medicare BasicsMedicare Advantage vs. Supplement: Which Fits You?Medicare BasicsMedicare Late Enrollment Penalties: How They Happen and How to Avoid ThemMedicare BasicsStill Working at 65? What to Do About Medicare and Employer Coverage
We do not offer every plan available in your area. Currently we represent 12 organizations which offer [ NUMBER ] products in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Assistance Program (SHIP) to get information on all of your options.